"You have never, ever, in your career seen a wealthy adult who is independent, has been a presidential candidate, suck up at the rate that Mitt Romney is sucking up," Gingrich said.

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Donald Trump and Mitt Romney meet

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Donald Trump and Mitt Romney meet

NEW YORK, NY - NOVEMBER 29: (L to R) President-elect Donald Trump and Mitt Romney dine at Jean Georges restaurant, November 29, 2016 in New York City. President-elect Donald Trump and his transition team are in the process of filling cabinet and other high level positions for the new administration. (Photo by Drew Angerer/Getty Images)

Former Massachusetts Governor Mitt Romney speaks after a dinner meeting with U.S. President-elect Donald Trump at Jean-Georges inside of the Trump International Hotel & Tower in New York, U.S., November 29, 2016. REUTERS/Lucas Jackson

NEW YORK, NY - NOVEMBER 29: (L to R) President-elect Donald Trump and Mitt Romney dine at Jean Georges restaurant, November 29, 2016 in New York City. President-elect Donald Trump and his transition team are in the process of filling cabinet and other high level positions for the new administration. (Photo by Drew Angerer/Getty Images)

US President-elect Donald Trump (L) dines with Mitt Romney (R) at Jean-Georges restaurant at Trump International Hotel and Tower, Tuesday, November 29, 2016 in New York.
Romney, a favorite among establishment Republicans for being named Secretary of State, met with Trump for their second face-to-face meeting in 10 days. / AFP / Bryan R. Smith (Photo credit should read BRYAN R. SMITH/AFP/Getty Images)

U.S. President-elect Donald Trump sits at a table for dinner with former Massachusetts Governor Mitt Romney (R) and his choice for White House Chief of Staff Reince Priebus (L) at Jean-Georges at the Trump International Hotel & Tower in New York, U.S., November 29, 2016. REUTERS/Lucas Jackson

U.S. President-elect Donald Trump sits at a table for dinner with former Massachusetts Governor Mitt Romney (R) and his choice for White House Chief of Staff Reince Priebus (L) at Jean-Georges at the Trump International Hotel & Tower in New York, U.S., November 29, 2016. REUTERS/Lucas Jackson

U.S. President-elect Donald Trump sits at a table for dinner with former Massachusetts Governor Mitt Romney (R) and his choice for White House Chief of Staff Reince Priebus (L) at Jean-Georges at the Trump International Hotel & Tower in New York, U.S., November 29, 2016. REUTERS/Lucas Jackson

U.S. President-elect Donald Trump sits at a table for dinner with former Massachusetts Governor Mitt Romney (R) at Jean-Georges inside of the Trump International Hotel & Tower in New York, U.S., November 29, 2016. REUTERS/Lucas Jackson

Former Massachusetts Governor Mitt Romney speaks after a dinner meeting with U.S. President-elect Donald Trump at Jean-Georges inside of the Trump International Hotel & Tower in New York, U.S., November 29, 2016. REUTERS/Lucas Jackson

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The former House speaker is a vocal supporter of Trump and was at one point a contender to be Trump's running mate. But he has been one of the members of Trump's inner circle to push back on the idea of Romney as secretary of state.

Gingrich continued:

"I am confident that he thinks now that he and Donald Trump are the best of friends, they have so many things in common. That they're both such wise, brilliant people. And I'm sure last night at an elegant three-star restaurant, he was happy to share his version of populism, which involve a little foie gras, a certain amount of superb cooking, but put that in a populist happy manner."

Romney, the former Massachusetts governor and 2012 GOP presidential nominee, is apparently still among the top four people under consideration for the secretary of state role. His candidacy has rubbed a few early Trump loyalists the wrong way.

On Tuesday, Bloomberg reported that the search was down to five candidates: 2012 Republican presidential nominee Mitt Romney, Senate Foreign Relations Committee Chair Bob Corker, former CIA Director David Petraeus, former New York City Mayor Rudy Giuliani, and retired Marine Corps Gen. John Kelly. Trump was meeting with Kelly on Wednesday.

Listen to Gingrich's interview below:

RELATED: U.S. presidents in their younger days:

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US presidents in their younger days

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US presidents in their younger days

This is the Naval Academy yearbook picture of a former president, can you guess who it is?

Click through to reveal the answer.

(Bettmann via Getty Images)

ANSWER: Jimmy Carter

(Photo by Dave Kotinsky/Getty Images)

This precious portrait was taken in the 1800's, do you recognize that face?

Click through for the answer.

(Photo by Interim Archives/Getty Images)

ANSWER: Franklin Delano Roosevelt

(Bettmann via Getty Images)

This president served as a five-star general before his time in the White Hosue.